diff --git a/MacOSX/10.5/libltdl.3.dylib b/MacOSX/10.5/libltdl.3.dylib
new file mode 100755
index 00000000..c2ca7ceb
Binary files /dev/null and b/MacOSX/10.5/libltdl.3.dylib differ
diff --git a/MacOSX/10.5/scripts/postflight b/MacOSX/10.5/scripts/postflight
index 77ecc3fc..525d3d91 100755
--- a/MacOSX/10.5/scripts/postflight
+++ b/MacOSX/10.5/scripts/postflight
@@ -21,4 +21,8 @@ for f in /Library/OpenSC/bin/*
 do
 	ln -sf $f /usr/local/bin
 done
+if !([ -e "/usr/lib/libltdl.3.dylib" ])
+then
+	cp /Library/OpenSC/lib/libltdl.3.dylib /usr/lib/libltdl.3.dylib
+fi
 exit 0
diff --git a/MacOSX/build b/MacOSX/build
index a3413e65..0ae5df08 100755
--- a/MacOSX/build
+++ b/MacOSX/build
@@ -129,6 +129,12 @@ mv OpenSC.tokend/build/OpenSC.tokend target/System/Library/Security/tokend
 mkdir -p target/usr/local/bin
 cp MacOSX/opensc-uninstall target/usr/local/bin
 
+# Copy libltdl.3.dylib, will be installed in /usr/lib by postflight script if needed
+case ${OSX_RELEASE} in
+"10.5")
+cp MacOSX/10.5/libltdl.3.dylib target/Library/OpenSC/lib/
+;;
+
 # Build installer package
 /Developer/Applications/Utilities/PackageMaker.app/Contents/MacOS/PackageMaker \
 -r target \